Good morning my dear friends .. Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals . Coral reefs are built by colonies of tiny animals found in marine waters that contain few nutrients . Most coral reefs are built from stony corals , which in turn consist of polyps that cluster in groups .. A coral reef is made of thin layers of calcium carbonate . Coral polyps form a living mat over a calcium carbonate skeleton . Stony corals ( or scle
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